exif(n) EXIF parsing exif(n)
NAME
exif - Tcl EXIF extracts and parses EXIF fields from digital images
SYNOPSIS
package require Tcl 8.2
package require exif ?1.1.2?
exif::analyze channel ?thumbnail?
exif::analyzeFile filename ?thumbnail?
exif::fieldnames
DESCRIPTION
The EXIF package is a recoding of Chris Breeze's Perl package to do the
same thing. This version accepts a channel as input and returns a
serialized array with all the recognised fields parsed out.
There is also a function to obtain a list of all possible field names
that might be present, which is useful in building GUIs that present
such information.
COMMANDS
exif::analyze channel ?thumbnail?
channel should be an open file handle rewound to the start. It
does not need to be seekable. channel will be set to binary
mode and is left wherever it happens to stop being parsed, usu-
ally at the end of the file or the start of the image data. You
must open and close the stream yourself. If no error is thrown,
the return value is a serialized array with informative English
text about what was found in the EXIF block. Failure during
parsing or I/O throw errors.
If thumbnail is present and not the empty string it will be
interpreted as the name of a file, and the thumbnail image con-
tained in the exif data will be written into it.
exif::analyzeFile filename ?thumbnail?
This is a file-based wrapper around exif::analyze. Instead of
taking a stream it takes a filename and analyzes the contents of
the specified file.
exif::fieldnames
This returns a list of all possible field names. That is, the
array returned by exif::analyze will not contain keys that are
not listed in the return from exif::fieldnames. Of course, if
information is missing in the image file, exif::analyze may not
return all the fields listed in the return from exif::field-
names. This function is expected to be primarily useful for
building GUIs to display results.
N.B.: Read the implementation of exif::fieldnames before modify-
ing the implementation of exif::analyze.
COPYRIGHTS
(c) 2002 Darren New Hold harmless the author, and any lawful use is
allowed.
ACKNOWLEDGEMENTS
This code is a direct translation of version 1.3 of exif.pl by Chris
Breeze. See the source for full headers, references, etc.
BUGS, IDEAS, FEEDBACK
This document, and the package it describes, will undoubtedly contain
bugs and other problems. Please report such in the category exif of
the Tcllib SF Trackers [http://source-
forge.net/tracker/?group_id=12883]. Please also report any ideas for
enhancements you may have for either package and/or documentation.
exif 1.1.2 exif(n)
Mac OS X 10.6 - Generated Thu Sep 17 20:27:05 CDT 2009